can i run a new python script on companion computer (Rpi which is loaded with ardusub O.S) for a sensor data reading?
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Hi,
Yes, it’s possible!
You can access companion via a SSH terminal, or a file manager that access companion via a ssh connection.
You can check more here: Redirecting...
Hello Patrick,
I also have a problem with running a python script on the companion side.
May I know if there is any possible way to run a python script once the companion side is ready (without a topside computer)?
I have tried to run the python script as a startup service (some Linux setting) but the script can only be executed after I connect the topside computer. The script executes after the Ethernet of companion side is ready, it is normal for an ROV when the top side computer is required but now I want to write some script for an AUV.
Thanks for helping!
Hi,
Yes, it’s totally possible, companion is a computer as any other, it’ll work with our without ethernet connection.
Please share your script and how did you configure companion to do such thing.
I would recommend to set a cron job if you want to run a program on the startup.
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Open the terminal via ssh or using the web terminal.
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Create a folder called my_program
mkdir my_program cd my_program
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Create a simple python program in the same directory
#!/usr/bin/env python from datetime import datetime import time # Create a file to write while True: with open('/tmp/my_output.txt', 'a') as file: # Get current time and print with our format now = datetime.now() current_time = now.strftime("%H:%M:%S") file.write("Time = {}\n".format(current_time)) # Sleep for 2 seconds and repeat time.sleep(2)
The program will write the actual time in a file called /tmp/my_output.txt, and it’ll repeat after 2 second.
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Make your program executable
chmod +x my_program.py
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get the full path of your program.
readlink -f my_program.py # it should output: /home/pi/my_folder/my_program.py
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Open the crontab editor
contrab -e
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Add your program with the reboot command in the end of the contrab editor
@reboot /home/pi/my_folder/my_program.py
The @reboot command will schedule your program to execute during the system boot
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Save and close the contrab editor
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Reboot your system
sudo reboot
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Check the output of the file
cat /tmp/my_output.txt
Time = 14:44:11 Time = 14:44:13 Time = 14:44:15 Time = 14:44:17 Time = 14:44:19 Time = 14:44:21 Time = 14:44:23 Time = 14:44:36 Time = 14:44:38 Time = 14:44:40 ...
As you can see, the file is being filled by our program after the reboot.